Research On Short-wave Direct Spread Signal Detection Technology

This dissertation makes efforts in crucial technologies of DSSS reconnaissance in short wave communication while laying emphasis on the nut problems including the detect of low SNB multi-signals based on the theory of wideband receiving,the characteristics extract and signal classification based on comprehensive processing in time and frequency processing,the detect and parameter extract of spectrum spread signals.The main work and innovative achievements obtained in this dissertation are summarized as follows:The first part of the ultra-shortwave spread spectrum communication system for the overall and modular analysis of the communication process of the various links and modules of the working principle and workflow are discussed.The corresponding theoretical model and simulation model are established for each module of communication system,and a perfect theory system and model library of communication system are formed.Some special narrowband interference suppression techniques are analyzed theoretically,the performances of several technologies are compared,the corresponding simulation models are established,and the simulation results are obtained.The second part focuses on the analysis of the square frequency algorithm,the autocorrelation characteristic,the power spectrum two algorithm and the cyclic spectrum algorithm in 4 detection algorithms,expounds the technical principle,establishes the theoretical model and the engineering commonly used simulation model.Based on the algorithm simulation,the detection performance of various algorithms is validated and the existing algorithm is improved.In the third part,combining the theoretical research results with practical application,perfecting the theory model of DSSS communication system,focusing on practical application,combining theory with actual simulation,the simulation model of DSSS signal detection and parameter estimation based on Wideband reception is established and simulated.It has certain reference value and guiding significance for practical engineering application.